Method of making cutters for pencil-sharpeners



A. P; WILSON.

METHOD OF MA KiNG CUTTERS FOR PENCIL SHARPENE RS.

APPUCATION FILED APR. 21, 1919.

1,383,045; Patented June 28,1921.

UNITED STATES PATENT OFHQlEl.

ALLEN PARKER WILSON, 0F WALTHAJVE, MASSACHUSETTS, ASSIGNOR T0 BOSTONPENCIL POINTER CGMPANY, O1 *WALTHAM, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

METHOD OF MAKING GUTTERS FOR PENCIL-SHARPEI TERS.

Application filed April 21, 1919.

To aZZw/zom it may concern:

Be it known that I, ALLEN P. VVILsON, a citizen of the United States,and resident of lValtham, in the county of Middlesex and State ot hlassachusetts, have invented a new and useful Improvement in Methods ofMaking Gutters for Pencil-Sharpeners, of which the following is aspecification.

This invention relates to improvements in the method of making cuttersfor pencil Sharpeners, with the object in View of providing a hollowcutter which is developed from sheet metal.

Another object is to provide a cutter of this character in which a sheetmetal blank is distorted to produce one or more pencil sharpening ribsand the blank then being curved and its side edges united to form a tubehaving the sharpening rib or ribs arranged spirally and exteriorlythereon.

A. practical embodiment of my invention is represented in theaccompanying drawings in which,

Figure 1. represents a plan view or a piece of sheet metal from whichthe blank for my improved cutter is taken.

Fig. 2. represents an edge view of the same.

Fig. 8. represents a plan view of the blank distorted to produce thepencil sharpening ribs thereon.

Fig. 42:. represents a section taken in the plane of the line IVIV ofFig. 3.

Fig. '5. represents a side view of the cutter, the pencil sharpeningribs being shown arranged spirally and exteriorly thereon.

Fig. 6. represents an end view of the same.

Fig. 7. represents a central section of the same.

The cutter comprises a tube 1 shown cylindrical in the present instance,and it is produced as follows. A blank 2 of rhomboidal form is cut froma piece of sheet metal 3 and it is distorted by stamping, rolling, orotherwise to produce pencil sharpening ribs e which project outwardlyfrom the surface of the blank. These sharpening rib are formed parallelto the diagonal side edge 6 so that when the blank is curved into itstubular form the sharpening ribs will be arranged spirally andexteriorly thereon, with specification of Letters Patent.

Patented June 28, 1321.

Serial No. 291,521.

the abutting side edges 6 meeting at a point between two sharpeningribs, as clearly shown in Fig. 5. These side edges 6 may be permanentlyunited by any well known or approved means.

The curving of the blank into its tubular form may be accomplished byany suitable device of well known or approved type.

It is to be understood that after the above operations are completed thetube may be hardened by any well known or approved process and if sodesired the exterior spiral sharpening ribs may be suitably sharpened.

What I claim is: v

1. The method of producing sheet metal cutters for pencil sharpenerscomprising distorting a sheet metal blank to produce one or more pencilsharpening ribs curving the blank into a tube having the rib or ribs arranged exterior-1y thereon, and uniting the meeting edges of the blank.

2. The method of producing sheet metal cutters for pencil Sharpenerscomprising distorting a sheet metal blank to produce one or more pencilsharpening ribs curving the blank into a tube having the rib or ribsarranged exteriorly thereon uniting the meeting edges of the blank andsharpening said ribs.

3. The method of producing sheet metal cutters for pencil sharpenerscomprising distorting a. sheet metal blank oi rhomboidal form to produceone or more diagonal pencil sharpening ribs, curving the blank into atube having the rib or ribs arranged. spirally and exteriorly thereonand uniting the meeting edges of the blank.

l. The method of producing sheet metal cutters for pencil sharpenerscomprising distorting a sheet metal blank of rhomboidal form to produceone or more diagonal pencil sharpening ribs, curving the blank into atube having the rib or ribs arranged spirally and exteriorly thereon,uniting the meeting edges of the blank and sharpening said ribs.

In testimony that I claim the foregoing as my invention 1 have signed myname this 14th day of February, 1919.

ALLEN PARKER WILSON.

